Pull socket



Oct. 18, 1927;. 1,646,002

is. c. WEBSTER PULL SOCKET v Filed May 4. 1926 2 Sheets-Sheet 1 .111 .1. Gig. 2

IN VEN TOR.

Benjamin (.Websfer A TTORNE Y.

Oct. 9 5, c. WEBSTER PULL SOCKET Filed May 4, 1926 4 2 Sheets-Shoot 2 Patented Get. 18, 1927.

nmrsn stares BEI TJAll/IEN C. VEBSTER, O15 JACKSON, MICE p SPRING" COMPANY, OF JACKSGN, MICHIGAN, A CO RIORATION OF TO REYNOLDS DIELAYV'ARE.

Application filed May 4,

The invention relates to improvements in chain pull sockets.

The object of the present invention is to improve the construction of chain pull soclc cts and similar devices and to provide a simple and comparatively inexpensive chain pull socket of strong and durable construction and equipped with efiicient switch mechanism adapted to open and close a circuit, and capable of aitording a rapid or snap action of the movable switch membe in opening and closing the switch mechanism; v

further obfect oi the invention is to provide a chain pull socket oi? this character in which the stationary switch contacts and thefiwirino terminals will be perfectly in-- sulatcd so that there will be no liability of arcing: or sparking.

\Vith these and other objects in view, the invention consists in, the construction and novel cmnbination and arrangement of parts hereinafter :tully described,illustrated in the accompanying drawings and pointed out in the claims hereto appended it help run a3 stood that various chan in the lot 151i portion and minor detalls'oit construction within the scope oithe claims, may be resorted to without departing; from the spirit or sacrilicino; any of the advantages of the invention.

I In the drawings:

Figurel'is a side elevation of a chain pull socket constructed in accordance with this invention; i I

F 2 is a similar view showing the opposite side thereof;

Fig. 3 a plan view of the chain pull socket; p

is a reverse plan view ot the same; F. s. '5 is a. longitudinal sectional view taken substantially on the line 5-5 of F 2;

Fig". 6 is a horizontal sectional view taken substantially on the line 66 of Fig. 5;the body portion of the insulating base being removed from the bottom plate;

Fig. 7 is a detailed perspective view of the bottom plate;. p a

Fig. 8 is a detailed perspective view of the rotary controller; p Fig. 9 is a similar view showing the lower face of the controller;

Fig. 10 is a detailed perspective view of PA'TEINTOFFICE.

roan, nssmnon, BY MESNE ASSIGNMENTS,

PULL SOCKET.

1926. Serial No. 106,685.

the oscillating actuator on a slightly on larged scale. 1

Fig. 11 is a similar view showing the lower face thereofi Fig. 12 is a detailed perspective view of the switch lever; i

F ig. 13 is a detailed perspective view of one of the stationary switch cont-acts.

Fig. 14L is a similar View of the other stationary switch contact; i

Fig. 15"isa detailed perspective viewot the wiring terminal ot'the screw shell c0ntact; Fig. 16 is a detailed perspective viewot the pivot post of the switch "mechanism; 7

Figbl'? is a detailed perspective view of thecoiled spring of the switch mechanism.

In the accon'ipanyinpdrawings in which is illustrated the preferred embodiment of the invention, 1 designates an insulating base constructed of asingle piece of molded plastic insulating i'i'iaterial such as balrelite, and consisting of an approximately circular top portion provided with spaced depending lugs 2 and 8 which form an intervening space for the switch mechanism hereinafter described and which are secured upon a bot tom plate at, also constructedot molded insulating material similar to the body portion of the ii'isulating base. The bottom plate or sectionot the insulatingbase is provided at itslower face with an enlargement 5 which fits ina correspondingly shaped opening 6 in the top of a screw shell contact 7, wherebythe latter is interlocked with the bottom section of the insulating base'to prevent relative rotary movement of the parts. The enlargement 5 ot the bottom section is provided with a recess 8 toreceive a center contact 9. The center contact 9, which is constructed of suitable conducting metal is approximately U-shaped and its lower portion, which is resilient, is provided with a head or enlargen'ient 10 of concavoconvex shape which is adapted to engage the plug of a lamp or other insertable device. The upper side or portion 01? the center contact is secured to the bottom sectionot the insulating base by means of a tubular rivet 11' which pierces the bottomsection'atthe centerthereofand secures one; of a parrot stationary contacts l2 and 13 t0" the upper face of the bottom section oitthe insulation base. The stationary switch contact 12 is provided with an extension 14: which extends inwardly to the center of the bottom section from one side of the same. The stationary switch contacts 12 and 13 consist of plates having vertical contact portions 15 and 16 which are located at opposite sides of a vertical lug or enlargement 17 formed integral. with the bottom section of the insulating base and forming a barrier or shield for separating and insulating the stationary contacts from each other so that there will be no liability of arcing or sparking. Spaced upwardly extending contacting portions 15 and 16 of the stationary switch contacts are beveled at their inner faces at the upper edges to facilitate engagement with blades 18 of a switch lever 19. The spaced parallel blades 18 of the switch lever 19 are provided with contact portions which are bevelled at their outer sides to facilitate engagement of the switch lever with the stationary contacts and to produce a wiping action on the same and to provide a perfect electrical connection between the switch lever and the stationary contacts. The stationary switch contact 13 is secured to the upper face of the base by a screw 20 which also secures a wiring terminal 21 .to the bottom section of the insulating base. The wiring terminal 21 consists of an L-shaped conductor bar forming a lower attaching arm or portion and provided at the top with a binding screw 22 and having projections 23 located adjacent to the binding screw for confining a wire in engagement with the same.

The wiring terminal 21, is located at one side of the insulating base and the switch mechanism hereinafter described forms a make and break in the circuit between the wiring terminal 21 and the center contact. A wiring terminal 24 which is connected with the screw shell contact 7 is located substantially at the opposite side of the insulating base, the lugs 2 and 3 being arranged between the wiring terminals and insulating the same from each other, as clearly illus trated in Fig. 2 of the drawings. The lugs 2 and 3 of the insulating base are also located at the outer sides of the stationary switch contacts and are interposed between the same and the wiring terminals, as clearly shown in Fig. 2 of the drawings, so that the wiring terminals are completely insu lated from each other as well as from the stationary contacts, which are insulated from each other by the integral lug or enlargement of the bottom section of the insulating base. The wiring terminal 24 consists of a conductor having an inwardly extending arm 25 at its lower end which extends through a recess 26 in the screw shell contact 7 and engages the lower face of the top thereof and is secured in position by one of a pair of screws 27 and 28 whlch pierce the lugs 2 and 3 and the bottom section.

The screw 27 has a threaded engagement with the attaching portion 25 of the wiring terminal 2% and the other screw 28 is provided at its lower end with a nut 29. The wiring tern'iinal 2a is provided at the top with a binding screw 30 and it has projections 31 located adjacent to the same for confining a wire in engagement with the binding screw.

The switch lever 19, which is constructed of a single piece of metal of suitable conducting material, consists of the said spaced )arallel knife blades 18, a central longi 'tudinal stem and a circular bearing portion 32 consisting of a ring provided at opposite sides with laterally extending pivot arms tapered downwardly to form substantially, knife-edge bearings which are arranged in bearing recesses 34 of spaced bearing lugs 35 formed integral with and extending upwardly from the upper face of the bottom section of the insulating base. The pivot arms 33 are located at diametrically opposite points at the sides of the circular bearing portion of the switch lever and fulcrum the switch lever adjacent to one end thereof and produce a relatively greatamount of movement of the switch blades which are located at the other end of the switch lever. The upper face of the circular bearing portion of the switch lever is provided with opposite cams 36 having their point or peak located adjacent the pivot arm and presenting inclined faces which extend downwardly and meet at the longitudinal axis of the switch lever. This provides a depression and enables a rotary controller 37 to lock the switch lever in either of its positions. The switch blades are arranged in parallelism in planes equidistant from the center of the circular bearing portion of the switch lever, and extend upwardly from opposite sides of the central stem or shank portion of the lever Which connects the blades with the circular bearing portion.

The rotary controller which is constructed of a single piece of molded bakelite or othersuitable material, consists of a disk provided at its lower face with an integral tapered or conical portion 38 which is tubular to receive a pivot post 39, and which fits within the circular opening of the hearing portion 32 of the switch lever. The rotary controller is also provided at its lower face with an annular boss or enlargement l0 and it has formed integral therewith a downwardly tapering tooth or lug ll which rides upon the circular bearing portion of the switch lever 19 and operates the latter through the rotary movement of the controller 37, producing a sudden quick or snap action of the switch lever in both the opening and closing movements thereof, by reason of the peak of the cams 36 being located at the pivot arms of the switch lever. The lug or tooth 41 rides up the incline at one side of one of the cams until it reaches the peak of the cam at the pivot arm, and a further rotary movementof the controller carries thetaperedlug beyond the pivot of the switch lever and the pressure of a. coiled spring 42 causes a quick.

- and is retained in the recess or depression formed by the adjacent, opposite inclined faces of the cams and is maintained in such position by the pressure of thecoiled spring;

42 so that the switch lever is firmly held in each of its positions. The rotary control.- ler 37 is provided at its upperface with a plm'ality of ratchet teeth 44 which may be either two or more, and which are engaged by ratchet teeth 45 at the lower face of the oscillating actuator. Anv desired number of the ratchet teeth maybe provided to se-- cure the proper rotary movement of the controller.

The actuator 43 consists of a metallic shell of cylindrical form open at the top and havinc; itsbottom stamped to form the ratchet teeth 45 and also to provide ratchet teeth 46 at the upper face of the bottom of thecylindrical actuator. The cylindrical actuator is provided in the center of'its bottom with an opening 47 to receive the pivot post 39 on which the coiled spring 42 is disposed and which is provided with a rectangular head 48 to fit in a squared portion 50 of an opening or recess in the top of the insulating base whereby the pivot is held against rotary movement. The upper section or body of the insulating base forms a cap or cover for thebottom section and it fits over the pivot post and retains the lower end of the latter in. a socket 5]. in the upper face of the bottom section. The upper end of the coiled spring 42 extends vertically through a perforation 53 in the polygonal head 48 of the pivot post 39 and the lower end 54 of the coiled spring 42 which is seated in the cylindrical actuator 43 is approximately l100l-Sl1XPQCl and is anranged to engage one ofthe ratchet teeth of the upper face of the bottom of the oscillating actuator 43. By this construction the upper end 52 of the spring is anchored and the lower end 54 of the spring is engaged with the actuator so that when the latter is partially rotated by a pull chain 55 to rotate the controller and force the lug or tooth 41 up the incline-of one of the cams of the switch lever, the spring will be compressed and its tension increased by a partialcoilinn; or twisting of the same so that when the tooth reaches the peak of the cam and is carried beyond the same to the opposite side thereof,.the tension of the spring will be sufiicient to produce a sudden snap action of the switch lever. As soon as the pull chain is released by the operator the coiled spring will untwist and return the actuator .to its normal or initial position and the teeth of the actuator in such backward movement will readily ratchet over the ratchet teeth of the controller. By pulling and re leasing the chain a rotary oscillatory move ment is imparted to the actuator. One side of the cylindrical actuator is slit and partially severed to form a tongue 56 which is provided with a horizontal slot 57 to 611 I between two of the links of the pull cha..n and after the tongue is engaged with the pull chain it is bent inwardly to close the.

outer end of the slotand confine the chain therein. The pull chain which is partially coiled. around the actuator extends outward ly through a chain guide 58 of tapered ap-- proximately funnel-shaped form Ct'llTlQtlbfv a bracket 59 consisting of approxii natel v is.-

shaped arms having inwardly extending slotted portions 60 forming resilient fingers which are snapped or sprung into recesses 61 in the top of the insulating base and the bottom section thereof. The slots 60 of the said arms enable the same to be compressed. and provide resilient engaging portions, as clearly illustrated in Fig. 6 of the drawings. By this construction, the bracket which carrice the chain guide may be readily snapped or removed therefrom and is securely retained in place without the use of screws or other fastening devices.

\Vhat is claimed is:

1. A pull socket including an insulating base, a switch lever provided with a circular bearing portion having cam faces at op posite sides thereof and pivoted intermediate of the ends of the cam faces, a rotary controller operating in the circular portion of the switch lever and provided with a lug movable over the cam faces thereof and having ratchet teeth at its upper face, an oscillatory actuator consisting of a substantial ly cylindrical shell provided at the upper and lower faces of its bottom with ratchet teeth, the lower ratchet teeth engaging the ratchet teeth of the controller, and a coiled spring disposed on the pivot post and having its upper end secured to the same and having its lower end engaged with one of the teeth of the actuator, said spring being adapted to be compressed by the movement of the said lug over the cam faces and to ill) . switch lever having a circular bearing portion forming a bearing openin and provided at opposite sides thereof with side cams and fulcrumed intermediate of the ends thereof on the bottom section a rotary controller having a depending tubular portion operating in the circular bearing opening of the switch lever, said controller being provided at its upper face with ratchet teeth and having a lug at its lower face movable over the said cams, an actuator consisting of a cylindrical shell arranged upon the controller and provided with ratchet teeth forengaging the teeth of the controller, a pivot post passing through the controller and the actuator and mounted at its ends in the sections of the insulating base, and a coiled spring disposed on the pivot post and anchored at its upper end and having its lower end engaged with the actuator d adapted to have its tension increased by the movement of the lug over the cams of the switch lever and the twisting of the spring by the actuator to produce a sudden snap action of the switch. lever when the lug is carried from one side of the pivot thereof to the other side of the same.

3. A pull socket including an insulating base provided with an upwardly extending lug, stationary switch contacts located at opposite sides of the lug, a, switch lever provided at one end with a circular bearing opening and having ram faces at opposite sides thereof on the insulating base, said switch lever being provided and. iulcrunied at the other end with spaced knife blades arranged at right angles to the pivot of the switch lever and adapted to be carried into andout of engagen'ient with the stationary switch contacts by the swinging movement of the switch lever and a rotary controller having a lug movable over the cam faces and adapted to be carried from one side of the pivot of the switch lever to the other for swinging the switch lever, an oscillatory actuator consisting of a cylindrical shell arranged on and encasing the rotary controller havingnieans for imparting a step by step rotary movement to the controller and in one direction, and a spring interlocked with the actuator and arranged to be tensioned by the rotary movement thereof and to be compressed by the movement of the controller over the cams of the switch lever and adapted when carried from one side of the pivotal point oi? the lever to the other to produce a sudden snap action of the same.

In testimony whereof I have hereunto set my hand.

BENJ. C. WEBSTER.

(iii 

